ADC Home > Reference Library > Reference > Mac OS X > Mac OS X Man Pages
|
This document is a Mac OS X manual page. Manual pages are a command-line technology for providing documentation. You can view these manual pages locally using the man(1) command. These manual pages come from many different sources, and thus, have a variety of writing styles. For more information about the manual page format, see the manual page for manpages(5). |
GETNETENT(3) BSD Library Functions Manual GETNETENT(3) NAME endnetent, getnetbyaddr, getnetbyname, getnetent, setnetent -- get net-work network work entry LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <netdb.h> void endnetent(void); struct netent * getnetbyaddr(uint32_t net, int type); struct netent * getnetbyname(const char *name); struct netent * getnetent(void); void setnetent(int stayopen); DESCRIPTION The getnetent(), getnetbyname(), and getnetbyaddr() functions each return a pointer to an object with the following structure containing the bro-ken-out broken-out ken-out fields of a line in the network data base, /etc/networks. struct netent { char *n_name; /* official name of net */ char **n_aliases; /* alias list */ int n_addrtype; /* net number type */ unsigned long n_net; /* net number */ }; The members of this structure are: n_name The official name of the network. n_aliases A zero terminated list of alternate names for the network. n_addrtype The type of the network number returned; currently only AF_INET. n_net The network number. Network numbers are returned in machine byte order. The getnetent() function reads the next line of the file, opening the file if necessary. The setnetent() function opens and rewinds the file. If the stayopen flag is non-zero, the net data base will not be closed after each call to getnetbyname() or getnetbyaddr(). The endnetent() function closes the file. The getnetbyname() function and getnetbyaddr() sequentially search from the beginning of the file until a matching net name or net address and type is found, or until EOF is encountered. The type must be AF_INET. Network numbers are supplied in host order. FILES /etc/networks DIAGNOSTICS Null pointer (0) returned on EOF or error. SEE ALSO networks(5) RFC 1101 HISTORY The getnetent(), getnetbyaddr(), getnetbyname(), setnetent(), and endnetent() functions appeared in 4.2BSD. BUGS The data space used by these functions is static; if future use requires the data, it should be copied before any subsequent calls to these func-tions functions tions overwrite it. Only Internet network numbers are currently under-stood. understood. stood. Expecting network numbers to fit in no more than 32 bits is prob-ably probably ably naive. BSD June 4, 1993 BSD |